Michaelmas daisy Syllabification: (Mich·ael·mas dai·sy)Translate Michaelmas daisy | into Italian Definition of Michaelmas daisy noun chiefly British an aster, especially Aster novae-belgii, a North American aster with numerous pinkish-lilac daisylike flowers that bloom around Michaelmas. Michaelmas daisy in other Oxford dictionaries Definition of Michaelmas daisy in the British & World English dictionary